Hey,
so lxc-clone will create a snapshot-based clone of an lvm-backed
container in about a second. Creating the first lvm-backed
container is a bit of a pain though. I do it using the script
below, called 'lxclvmconvert' on my machine. So I do
lxc-create -t ubuntu -f /etc/lxc.conf -n mavbase -- -r maverick
lxclvmconvert mavbase
and from then on I can do fast
lxc-clone -s -o mavbase -n mav-bugxyz
My question is, where do we want to put this functionality? Of course
I *can* put it in the ubuntu template itself, but I'm leary of adding
too many options to that. Consider that just for the lvm support we'd
need to add optional arguments for:
backing store type: (lvm, loopback file, real blockdev)
backing store fstype
backing store size
other options, i.e. lvm volume group name
So, do you think it would be better for the container creation templates
to offer this support, or to have a separate tool, not lxclvmconvert, but
maybe 'lxc-convert', which converts a container from any supported backing
type to any other. Backing types I guess could start out by including
directory (the current way)
lvm
loopback file
raw device
thanks,
-serge
#!/bin/sh
if [ $# -lt 1 ]; then
echo "Usage: $0 container-name <size> <fstype>"
exit 1
fi
c=$1
size=2G
fstype=ext3
echo "converting container $c"
if [ $# -gt 1 ]; then
size=$2
echo "Using size $size"
fi
if [ $# -gt 2 ]; then
fstype=$3
echo "Using fstype $fstype"
fi
if [ ! -d /var/lib/lxc/$c/rootfs ]; then
echo "Container $c doesn't seem to exist?"
exit 1
fi
if [ -e /dev/lxc/$c ]; then
echo "/dev/lxc/$c already exists. Bailing"
exit 1
fi
lvcreate -L $size -n $c lxc || cleanup
sleep 1
mkfs -t $fstype /dev/lxc/$c
if [ $? -ne 0 ]; then
echo "Failed to create the filesystem"
lvremove -f /dev/lxc/$c
exit 1
fi
mkdir /var/lib/lxc/$c/lvm || { lvremove -f /dev/lxc/$c; exit 1; }
mount -t $fstype /dev/lxc/$c /var/lib/lxc/$c/lvm || { lvremove -f /dev/lxc/$c;
exit 1; }
rsync -va /var/lib/lxc/$c/rootfs/ /var/lib/lxc/$c/lvm || echo "Rsync had
errors, you may want to check; continuing"
umount /var/lib/lxc/$c/lvm
rmdir /var/lib/lxc/$c/lvm
rm -rf /var/lib/lxc/$c/rootfs
mkdir /var/lib/lxc/$c/rootfs
sed -i '/lxc.rootfs/d' /var/lib/lxc/$c/config
echo "lxc.rootfs = /dev/lxc/$c" >> /var/lib/lxc/$c/config
echo "Finished"
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